Artificial tooth.



'e. E. FRITZ.

ARTIFICIAL TOOTH.

APPLICATION FILED AUG.31| m4.

1,135,007. a Patented Apr. 13,1915.

Mim ssos "a rn nun'rn-IJYHQ. WASHINGTDIL-D. c.

' la manon', oFoHIcAeo, ILLINOIS.

I To all whom it may concern: 1

Be it known that I, GUSTAV, E. FRITZ, min-.-

1 zen of the United States, residing at Chivcago, in the county of Cook and State of;

Illinois, have invented certain new and useful Improvements in Artificial Teeth, of which the following is a specification."

i a ll This invention relates'broadly to improve- 'ments in artificial teeth, and more specifically to a' new and improved anterior detachable or replaceable crown. The inven tionmay also be embodied in blcuspid and molar detachable or replaceable crowns.

In the drawings :'F igure 1 :isan enplace, in the crown; Fig. 3 is-a detail -view of the pin; Figs. 4 and 5 are crosssections ofthe pin at points A'A. and B-B respectively, of Fig. 3, and Fig. dis a sectional'view, enlarged, of a biscup1d crown with detachable pin, showing my improve- That part of the pin 7 which protrudesfrom f ments. 7

" spending parts throughout the figures.

,1 denotes the anterior crown formed with V ,the labial surface 2, the lingual surface 3,

l the incisal edge 4, a saucer shaped base 5 and an opening 6 to receive the detachable re-v taining pin 7. V

In Figs. 1 and 2 the dotted line 8 denotes theoutline of the lingual surface, as heretofore made, which produced considerable bulkiness in the crown and which had to be ground by the dentist to obtain a perfect articulation or occlusion. N This bulkiness was necessary owing to the usual straight peculiarly shaped curved opening 6, making it possible for me to mold and bake a crown without such bulky part of porcelain on the lingual surface, thereby facilitating perfect articulation or, occlusion, without grinding crown, and by providing. a curved pin 7 to correspond to the opening in the crown, the tooth will resist anterior posterior force during mastication or incising, and prevent Like characters of reference denote corre g 1n cross-sect on, as at -l3, that 1s, the greatest;

nn'rrrroran rooms.

Application filed August 31,1914; $6113.11). 659,277 g I rotation'of crown the pin. tlThe'open GUsTAvn. rnrrz, or CHICAGO, ILLINOIS, ASSIGNOBJ or ens-Herero rrro v a 'G i 1 specifica tion of Ietters Patent. 13, i i V ing, 6, leadsinto the. crown'from a central point in the saucer shaped base 5 and is curvedfasv shown, the labial wall of said opening following approximately the curva turepfthelabial surface 2 ofsaid crown, thelingual-wall' ofsaid opening'following} approximately the curvature of-the lingual" surface 3 ofsaid crown.

perfectly round" to receive a correspending 1:

part 10 of the pin 7, and the base 11 of said opening is convex or rounded, to obviateany sharp edgesor corners in the crown, and-the.

end of the pin 12 is similarly shaped, or

formed. The lingual wall of the opening 6,

in thecrown, where it opens out of the saucer shaped base 5 is formed with an enment, or bulky, or swelled part 13 of the pin 7, whichis so made to resist the stress at this particular point in the crown; I have This, opening 1s largement or seat 12 to receive an enlar gestated that that portion of the pin 10-, which enters the crown is round in cross-section.

width of the pin is arranged in such manner as to directly absorb side 'thrusts and similar forces produced during mastication,

" T he enlargement or seat 12 inthe'opening 6' in the crown facilitates the easy movement of the crown uponthe pin andthe shape'of said pinwhen the crown has been cemented in place will insure'it against accidental displacement or becoming dislodged under pres- 7 sure of mastication. There may be several ways of obtaining the correct shaped curved opening in the crown, when molding same. A preferred method is to mold the crown on a pin of correct shape, of amaterial which will burn away under the intense heat of baking the crown. g In I have wn H yt-improvements" as applied toa bicuspid crown and although not shown, the same may be embodied in a molar crown. The bicuspid is designatedlf having, a palatal surface 15, a buccal surface 16, a buccal cusp 17., and, a lingual cusp '18.

opening 6, except that theopening or hold 20 terminates'in the buccal cusp. In this way, the pin 19 goes into the bulky buccal cusp instead of toward the sulci, which so V '2 Would Weaken the tooth and entering the buccal cusp lateral force is the better resisted. The protruding end of the pins 7 and 19 may be milled or roughened in any manner, if desired.

What I claim is:

1. In an artificial tooth crown mounting,

the combination With a croWn having an opening entering the same from a point approximately centrally of its base, said opening being curved in its length, and substantially circular in cross section With its largest dimension at the mouth of the opening, and a' pin adapted to fit Within said opening and hold said crown in place, said pin having one portion thereof of substan tially the same contour as the opening in said crown, and having its largest diameter substantially adjacent the mouth ofsaid opening When said crown is in position upon said pin.

2. A fastening pin for an artificial crown tooth comprising, a tapering oval shaped lower portion adapted to be secured Within a tooth, an upper portion of substantially circular cross section and formed with a reverse curve extending away from and then substantially parallel to the longitudinal axis of said lower portion, the largest diameter of said pin being at a cross section taken through the curve nearest the transverse middle of the pin.

In testimony whereof I aiiix my signature, in presence of tWo Witnesses.

GUSTAV E. FRITZ. Witnesses Gno. H. HERRIon, C. W. MACKETT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. O. 

